California Solar Contractor (C-46)
Exam With Actual Questions &
Verified Answers,Plus
Rationales/Expert Verified For
Guaranteed Pass Graded A+/2026
/Latest Update/Instant Download Pdf
1. What is the primary purpose of a solar inverter in a photovoltaic (PV)
system?
A. To store electrical energy
B. To convert DC to AC power
C. To increase the voltage of the solar panels
D. To monitor system performance
Answer: B. To convert DC to AC power
Rationale: Inverters change the direct current (DC) electricity produced
by solar panels into alternating current (AC) for use in homes and the
grid.
2. What is the standard unit of solar irradiance?
A. Joules
B. Watts per square meter (W/m²)
C. Lumens
D. Kilowatt-hours
Answer: B. Watts per square meter (W/m²)
Rationale: Solar irradiance is the power per unit area received from the
sun, measured in W/m².
,3. What does the acronym STC stand for in solar testing conditions?
A. Standard Test Conditions
B. Solar Thermal Capacity
C. Static Temperature Calibration
D. Solar Transmission Coefficient
Answer: A. Standard Test Conditions
Rationale: STC defines standardized conditions (1000 W/m² irradiance,
25°C cell temperature, 1.5 air mass) for comparing PV performance.
4. Which of the following best describes a grid-tied solar PV system?
A. Operates independently of the utility grid
B. Provides backup power during outages
C. Connects directly to the utility grid
D. Uses only battery storage
Answer: C. Connects directly to the utility grid
Rationale: Grid-tied systems supply power to both the property and the
utility grid, without needing batteries.
5. Which agency regulates electrical installations in California?
A. California Energy Commission
B. Department of Consumer Affairs
C. California Public Utilities Commission
D. California Contractors State License Board (CSLB)
Answer: D. California Contractors State License Board (CSLB)
Rationale: CSLB oversees contractor licensing, including C-46 solar
contractors.
6. What is the primary factor that determines solar panel output?
A. Panel color
B. Temperature
C. Sunlight intensity and angle
D. Wind speed
, Answer: C. Sunlight intensity and angle
Rationale: Maximum power is achieved when sunlight strikes panels
perpendicularly and intensity is high.
7. Which type of current is produced directly by photovoltaic cells?
A. Alternating current
B. Direct current
C. Pulsed current
D. Split-phase current
Answer: B. Direct current
Rationale: PV cells generate DC electricity which must be inverted for AC
use.
8. What is the average voltage of a typical residential solar panel?
A. 5–10V
B. 12–18V
C. 30–40V
D. 60–80V
Answer: C. 30–40V
Rationale: Most modern solar panels operate around 30–40 volts per
module.
9. What is net energy metering (NEM)?
A. A tax incentive
B. A method of measuring total solar production
C. A billing mechanism that credits excess solar generation
D. A power storage system
Answer: C. A billing mechanism that credits excess solar generation
Rationale: NEM allows customers to offset utility charges with exported
solar energy.
Exam With Actual Questions &
Verified Answers,Plus
Rationales/Expert Verified For
Guaranteed Pass Graded A+/2026
/Latest Update/Instant Download Pdf
1. What is the primary purpose of a solar inverter in a photovoltaic (PV)
system?
A. To store electrical energy
B. To convert DC to AC power
C. To increase the voltage of the solar panels
D. To monitor system performance
Answer: B. To convert DC to AC power
Rationale: Inverters change the direct current (DC) electricity produced
by solar panels into alternating current (AC) for use in homes and the
grid.
2. What is the standard unit of solar irradiance?
A. Joules
B. Watts per square meter (W/m²)
C. Lumens
D. Kilowatt-hours
Answer: B. Watts per square meter (W/m²)
Rationale: Solar irradiance is the power per unit area received from the
sun, measured in W/m².
,3. What does the acronym STC stand for in solar testing conditions?
A. Standard Test Conditions
B. Solar Thermal Capacity
C. Static Temperature Calibration
D. Solar Transmission Coefficient
Answer: A. Standard Test Conditions
Rationale: STC defines standardized conditions (1000 W/m² irradiance,
25°C cell temperature, 1.5 air mass) for comparing PV performance.
4. Which of the following best describes a grid-tied solar PV system?
A. Operates independently of the utility grid
B. Provides backup power during outages
C. Connects directly to the utility grid
D. Uses only battery storage
Answer: C. Connects directly to the utility grid
Rationale: Grid-tied systems supply power to both the property and the
utility grid, without needing batteries.
5. Which agency regulates electrical installations in California?
A. California Energy Commission
B. Department of Consumer Affairs
C. California Public Utilities Commission
D. California Contractors State License Board (CSLB)
Answer: D. California Contractors State License Board (CSLB)
Rationale: CSLB oversees contractor licensing, including C-46 solar
contractors.
6. What is the primary factor that determines solar panel output?
A. Panel color
B. Temperature
C. Sunlight intensity and angle
D. Wind speed
, Answer: C. Sunlight intensity and angle
Rationale: Maximum power is achieved when sunlight strikes panels
perpendicularly and intensity is high.
7. Which type of current is produced directly by photovoltaic cells?
A. Alternating current
B. Direct current
C. Pulsed current
D. Split-phase current
Answer: B. Direct current
Rationale: PV cells generate DC electricity which must be inverted for AC
use.
8. What is the average voltage of a typical residential solar panel?
A. 5–10V
B. 12–18V
C. 30–40V
D. 60–80V
Answer: C. 30–40V
Rationale: Most modern solar panels operate around 30–40 volts per
module.
9. What is net energy metering (NEM)?
A. A tax incentive
B. A method of measuring total solar production
C. A billing mechanism that credits excess solar generation
D. A power storage system
Answer: C. A billing mechanism that credits excess solar generation
Rationale: NEM allows customers to offset utility charges with exported
solar energy.
